ADMOS AMS2908CD-5.0, AMS2908CD-3.3, AMS2908CD-2.85, AMS2908CD-2.5, AMS2908CD-1.5 Datasheet

Advanced AMS2908
Monolithic 800mA LOW DROPOUT VOLTAGE REGULATOR

Systems

FEATURES APPLICATIONS

•• Three Terminal Adjustable or Fixed Voltages* •• High Efficiency Linear Regulators

1.5V, 2.5V, 2.85V, 3.3V and 5.0V

•• Output Current of 800mA •• 5V to 3.3V Linear Regulator

•• Operates Down to 1V Dropout •• Battery Chargers

•• Line Regulation: 0.2% Max. •• Active SCSI Terminators

•• Load Regulation: 0.4% Max. •• Power Management for Notebook

•• SOT-223 and TO-252 package available •• Battery Powered Instrumentation

GENERAL DESCRIPTION

The AMS2908 series of adjustable and fixed voltage regulators are designed to provide 800mA output current and to operate
down to 1V input-to-output differential. The dropout voltage of the device is guaranteed maximum 1.3V at maximum output
current, decreasing at lower load currents.
On-chip trimming adjusts the reference voltage to 1%. Current limit is also trimmed, minimizing the stress under overload
conditions on both the regulator and power source circuitry.
The AMS2908 devices are pin compatible with other three-terminal regulators and are offered in the low profile surface
mount SOT-223 package and in the TO-252 (DPAK) plastic package.

•• Post Regulators for Switching Supplies

ORDERING INFORMATION:

PACKAGE TYPE OPERATING JUNCTION

TO-252 SOT-223

TEMPERATURE RANGE

AMS2908CD AMS2908
AMS2908CD-1.5 AMS2908-1.5
AMS2908CD-2.5 AMS2908-2.5
AMS2908CD-2.85 AMS2908-2.85
AMS2908CD-3.3 AMS2908-3.3
AMS2908CD-5.0 AMS2908-5.0

*For additional available fixed voltages contact factory.

PIN CONNECTIONS

FIXED VERSION ADJUSTABLE VERSION

1- V

IN

2- Ground
3- V

OUT

1- V

IN

2- Adjust
3- V

OUT

0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C

SOT-223 Top View

1

2 3

TO-252 FRONT VIEW

3
2
1

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]

Junction Temperature Range

JA

AMS2908

ABSOLUTE MAXIMUM RATINGS (Note 1)

Power Dissipation Internally limited Soldering information
Input Voltage 15V Lead Temperature (10 sec)
Operating
Control Section
Power Transistor
Storage temperature

0°C to 125°C

0°C to 150°C

- 65°C to +150°C

Thermal Resistance
TO-252 package
SOT-223 package

* With package soldering to copper area over backside
ground plane or internal power plane ϕ
46°C/W to >90°C/W depending on mounting technique and
the size of the copper area.

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at I

Parameter Device Conditions Min Typ Max Units

= 0 mA, and TJ = +25°C unless otherwise specified.

OUT

300°C

ϕ JA= 80°C/W

ϕ JA= 90°C/W*

can vary from

Reference Voltage
(Note 2)

Output Voltage
(Note 2)

Line Regulation AMS2908

Load Regulation
(Notes 2, 3)

AMS2908 I

AMS2908-1.5

AMS2908-2.5

AMS2908-2.85

AMS2908-3.3

AMS2908-5.0

AMS2908-1.5

AMS2908-2.5

AMS2908-2.85

AMS2908-3.3

AMS2908-5.0

AMS2908

AMS2908-1.5

AMS2908-2.5

AMS2908-2.85

AMS2908-3.3

AMS2908-5.0

= 10 mA

OUT

10mA ≤ I
0 ≤ I

0 ≤ I

0 ≤ I

0 ≤ I

0 ≤ I

I

LOAD

3.0V≤ VIN ≤ 12V

4.0V≤ VIN ≤ 12V

4.35V≤ VIN ≤ 12V

4.75V≤ VIN ≤ 12V

6.5V≤ VIN ≤ 12V

(VIN - V

VIN = 5V, 0 ≤ I

VIN = 5V, 0 ≤ I

VIN = 5V, 0 ≤ I

VIN = 5V, 0 ≤ I

VIN = 8V, 0 ≤ I

≤ 800mA, 1.5V≤ (VIN - V

OUT

≤ 800mA , 4.35V≤ VIN ≤ 12V

OUT

≤ 800mA , 4.35V≤ VIN ≤ 12V

OUT

≤ 800mA , 4.35V≤ VIN ≤ 12V

OUT

≤ 800mA , 4.75V ≤ VIN ≤ 12V

OUT

≤ 800mA , 6.5V ≤ VIN ≤ 12V

OUT

= 10 mA , 1.5V≤ (VIN - V

) =3V, 10mA ≤ I

OUT

≤ 800mA

OUT

≤ 800mA

OUT

≤ 800mA

OUT

≤ 800mA

OUT

≤ 800mA

OUT

OUT

≤ 800mA

OUT

OUT

) ≤ 12V

) ≤ 12V

1.238

1.225

1.485

1.476

2.475

2.460

2.82

2.79

3.267

3.235

4.950

4.900

1.250

1.250

1.500

1.500

2.500

2.500

2.850

2.850

3.300

3.300

5.000

5.000

0.015

0.035

0.3

0.6

0.3

0.6

0.3

0.6

0.5

1.0

0.5

1.0

0.1

0.2

3

6

3

6

3

6

3

7

5

10

1.262

1.270

1.515

1.524

2.525

2.560

2.88

2.91

3.333

3.365

5.050

5.100

0.2

0.2

5

6

6

6

6

6

10

10

10

10

0.3

0.4

10

20

12

20

12

20

15

25

20

35

V
V

V
V

V
V

V
V

V
V

V
V

%
%

mV
mV

mV
mV

mV
mV

mV
mV

mV
mV

%
%

mV
mV

mV
mV

mV
mV

mV
mV

mV
mV

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]

AMS2908

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at I

Parameter Device Conditions Min Typ Max Units

= 0 mA, and TJ = +25°C unless otherwise specified.

OUT

Dropout Voltage
(V

- V

OUT

)

IN

Current Limit AMS2908-1.5/-2.5/-2.85/

AMS2908-1.5/-2.5/-2.85/

-3.3/-5.0

∆V

OUT

(VIN - V

, ∆V

OUT

= 1%, I

REF

) = 5V

= 800mA (Note 4)

OUT

1.1 1.3

900 1,100 1,500

V

mA

-3.3/-5.0

Minimum Load

AMS2908 (VIN - V

) = 12V (Note 5)

OUT

5 10

mA

Current
Quiescent Current AMS2908-1.5/-2.5/-2.85/

VIN ≤ 12V

5 10

mA

-3.3/-5.0

Ripple Rejection AMS2908

AMS2908-1.5

f =120Hz , C
(VIN-V

) = 3V, C

OUT

f =120Hz , C

= 25µF Tantalum, I

OUT

=25µF

ADJ

= 25µF Tantalum, I

OUT

= 800mA,

OUT

= 800mA,

OUT

60 75

60 72

dB

dB

VIN = 6V

AMS2908-2.5

f =120Hz , C

= 25µF Tantalum, I

OUT

= 800mA,

OUT

60 72

dB

VIN = 6V

AMS2908-2.85

f =120Hz , C

= 25µF Tantalum, I

OUT

= 800mA,

OUT

60 72

dB

VIN = 6V

AMS2908-3.3

f =120Hz , C

= 25µF Tantalum, I

OUT

= 800mA

OUT

60 72

dB

VIN = 6.3V

AMS2908-5.0

f =120Hz , C

= 25µF Tantalum, I

OUT

= 800mA

OUT

60 68

dB

VIN = 8V

Thermal Regulation AMS2908 TA = 25°C, 30ms pulse 0.008 0.04 %W
Adjust Pin Current AMS2908

Adjust Pin Current

AMS2908

Change
Temperature Stability

10mA ≤ I

10mA ≤ I

≤ 800mA , 1.5V≤ (VIN - V

OUT

≤ 800mA , 1.5V≤ (VIN - V

OUT

OUT

OUT

) ≤ 12V

) ≤ 12V

55

120

0.2 5

0.5

µA
µA

µA

%
Long Term Stability TA =125°C, 1000Hrs 0.3 1 %
RMS Output Noise

(% of V

OUT

)

Thermal Resistance

TA = 25°C , 10Hz ≤ f ≤ 10kHz

0.003 %

15 °C/W

Junction-to-Case

Parameters identified with boldface type apply over the full operating temperature range.

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and test conditions, see the

Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed.

Note 2: Line and Load regulation are guaranteed up to the maximum power dissipation of 1.2 W. Power dissipation is determined by the input/output differential

and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range.

Note 3: See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured at a constant junction

temperature by low duty cycle pulse testing. Load regulation is measured at the output lead ~1/8” from the package.

Note 4: Dropout voltage is specified over the full output current range of the device.
Note 5: Minimum load current is defined as the minimum output current required to maintain regulation. When 1.5V ≤ (V

guaranteed to regulate if the output current is greater than 10mA.

- V

) ≤ 12V the device is

IN

OUT

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]